Clinical significance of P-glycoprotein expression analyzed by immunohistochemical staining in cancer tissues.

R Kim, N Hirabayashi, M Nishiyama, K Aogi, T Toge
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引用次数: 1

Abstract

P-glycoprotein is a transmembrane protein with increased drug efflux from resistant cells, which is encoded by the MDR1 gene. An overexpression of P-glycoprotein has been reported to correlate with the degree of resistance to anticancer agents, especially to adriamycin. In this study, the expression of P-glycoprotein was analyzed immunohistochemically by using a monoclonal antibody, MRK16 against P-glycoprotein in 18 fresh human tumors. The expression of P-glycoprotein was detected in eight (44 per cent) tumor specimens out of 18 patients. Although six (75.0 per cent) of the 8 P-glycoprotein positive tumors were resistant to adriamycin, the other two tumors showed clinical responses. Furthermore, five (50.0 per cent) of the 10 P-glycoprotein negative tumors exhibited positive clinical responses. These results suggest that P-glycoprotein expression may not be a useful marker to predict intrinsic resistance to adriamycin in fresh human tumors.

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免疫组化染色分析肿瘤组织p -糖蛋白表达的临床意义。
p糖蛋白是一种由MDR1基因编码的跨膜蛋白,耐药细胞的药物外排增加。据报道,p糖蛋白的过表达与对抗癌药物,特别是对阿霉素的耐药程度有关。本研究采用抗p -糖蛋白单克隆抗体MRK16免疫组化方法分析了18例新鲜人肿瘤中p -糖蛋白的表达。18例患者中有8例(44%)肿瘤标本检测到p -糖蛋白的表达。虽然8例p -糖蛋白阳性肿瘤中有6例(75.0%)对阿霉素耐药,但其他2例肿瘤表现出临床反应。此外,10例p糖蛋白阴性肿瘤中有5例(50.0%)表现出阳性临床反应。这些结果表明,p糖蛋白表达可能不是预测新鲜人肿瘤对阿霉素内在耐药性的有用标记。
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